The SP230-L pyranometer, manufactured by Apogee, includes a 0.18 W internal heater and an elevated base that allow it to provide solar radiation measurements during the most severe weather. Its small heater draws just 15 mA of current, allowing it to be powered by a small solar panel and battery─even on days with a short duration of daylight and at high latitudes (far away from the equator). Note: In the image, the SP230-L is shown mounted to a 18356 Leveling Base and a CM225 Solar Sensor Mounting Stand.